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Table 3 Comparisons of threshold changes between SNHL and CHL ear during follow-up period by noise level

From: Comparisons of hearing threshold changes in male workers with unilateral conductive hearing loss exposed to workplace noise: a retrospective cohort study for 8 years

  Noise level < 85 dBA (N = 53) Noise level ≥ 85 dBA (N = 25)
Difference of Air conduction Difference of Bone conduction Difference of Air-bone gap Difference of Air conduction Difference of Bone conduction Difference of Air-bone gap
kHz Meana SDd p Meanb SDd p Meanc SDd p Meana SDd p Meanb SDd p Meanc SDd p
0.5 −0.9 8.9 0.469 −2.5 8.2 0.027 1.7 7.8 0.125 −0.6 5.8 0.633 1.8 22.7 0.702 −2.3 23.0 0.618
1 −0.6 10.5 0.695 −2.1 10.4 0.147 1.5 8.1 0.175 −1.9 8.5 0.280 −3.5 8.6 0.051 1.6 4.8 0.098
2 −0.8 10.3 0.578 −0.5 11.0 0.757 −0.3 6.9 0.737 −0.1 8.0 0.960 −1.8 8.2 0.270 1.8 6.7 0.202
3 1.0 10.5 0.477 1.9 8.9 0.131 −0.8 7.6 0.432 2.7 8.3 0.118 0.6 9.9 0.750 2.0 7.8 0.202
4 2.2 10.7 0.149 0.3 7.3 0.794 1.9 7.9 0.087 5.6 8.8 0.004 2.1 6.6 0.124 3.4 6.7 0.017
6 1.2 13.0 0.503 - - - - - - −0.4 13.7 0.896 - - - - - -
  1. p-value was calculated by paired t-test; aMean, difference of air conduction threshold (2013-2006) at SNHL ear vs. difference of air conduction threshold (2013-2006) at CHL ear; bMean, difference of bone conduction threshold (2013-2006) at SNHL ear vs. difference of bone conduction threshold (2013-2006) at CHL ear; cMean, average of air-bone gap; d SD standard deviation